modified

2026-06-09 18:39:25 +02:00 · 2023-11-24 22:35:41 +01:00
parent 3c0b507a93
commit 7644b2a0f7
45165 changed files with 4803356 additions and 3 deletions
@@ -0,0 +1,32 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+*/
+
+"use strict";
+
+/** @template T @typedef {function(): T} FunctionReturning */
+
+/**
+ * @template T
+ * @param {FunctionReturning<T>} fn memorized function
+ * @returns {FunctionReturning<T>} new function
+ */
+const memoize = fn => {
+	let cache = false;
+	/** @type {T | undefined} */
+	let result = undefined;
+	return () => {
+		if (cache) {
+			return /** @type {T} */ (result);
+		} else {
+			result = fn();
+			cache = true;
+			// Allow to clean up memory for fn
+			// and all dependent resources
+			fn = undefined;
+			return /** @type {T} */ (result);
+		}
+	};
+};
+
+module.exports = memoize;